<p><em>Editor?s note:</em><div>When we test boards, we usually think in terms of traditional electrical test(in-circuit, flying probe) and nonelectrical test (optical, x-ray). This OrebroUniversity article develops an alternative, connectionless technique basedon scanning the electromagnetic field generated by active on-board devices.Could this make it into industry as an additional diagnostic tool?</div><div>--R.G. (Ben) Bennetts</div><div>Bennetts Associates</div></p>